Improvement in tool-holders for grinders



EDWARD F.EDGECOMB.

Patented Dec. 1,2, 1871.

ituwm. @i i gamin W/@ UNITED STATES PATENT QEEICE.

EDWARD F. EDGECOMB, OF MEGHANICS FALLS, MAINE.

IMPROVEMENT IN TOOL-HOLDERS FOR GRINDERS.

Specication forming part of Letters Patent No. 121,766, dated December12, 1871.

To all whom t may concern:

Be it known that I, EDWARD F. EDGEOOMB, of Mechanics Falls, in thecounty of Androscoggin and State of Maine, have invented a new anduseful Improved rFool Holder for Grindstones; and I do hereby declarethat the following is a full, clear, and exact description thereof,which will enable others skilledV in the art to make and use the same,reference being had to the accompanying drawing forming a part of thisspecification.

My invention consists of a stand to rest on the grindstone-frame by across-bar fitted in bearings to hold it in a leaning position and allowit to be adjusted sidewise, on the. top of which stand is an oscillatingbeam with an adjusting-screw, and on the beam is a tool-holding clampinclining still more toward the stone and pivoted to the said oscillating beam so that it may be oscillated to grind the tool rounding on theend, all as hereinafter more fully described.

Figure l is a sectional elevation of my improved tool-holder and sideelevation of part of a grindstone, the section being taken on the line ma' of Fig. 2. Fig. 2 is a front elevation, and Fig. 3 is a section ofFig. l on the line y y.

Similarletters of" reference indicate corresponding parts.

A is the stand, which has a cross-bar, B, at the lower end, resting inthe bearin gs C npon the top ofthe grindstone-frame D, n ear one end andfronting the face of the stone, the arrangement being such thatthe standcan be readily shifted sidewise. E is an oscillating beam at the top ofthe stand, with an arm, F, projecting frontwise, to be acted on by anadjusting-screw, G, which screws up and down through the cross-piece Hto raise and lower the arm and oscillate the beam E. I is a tool-holdingclamp pivoted at K to the beam E, and adjusted so as .to pitch forwardtoward the face of the stone at the top. It is provided with abinding-screw, L, at the upper end, under which the tool is placed andclamped down tight, to be held on the stone. This holder, having a toolplaced in it--say a plane ironand resting in the bearings O, will beleaned toward the stone till the tool comes in contact with it. Then theadjustin g-screw G will be screwed up or down, according as to whetherthe edge is to be blunt or thin, and then the holder will be pressedagainst the stone by hand; or this may be done by aweight suspended fromthe beam E, as indicated by the dotted line M. The holder' may beshifted sidewise on the bearings to grind evenly on both sides of thestone, and if' the edge is to be slightly rounded or the corners roundedoft' the holder I will be oscillated on the pivot K.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- The improved tool-holderi'or grindstones, consistingof the stand A, cross-bar B, bearings C, holder I, oscillating beam E,arm F, adjustingscrew and binding-screw L, the holder I being pivoted tothe oscillating beam, and all combined and arranged and adapted forapplication to a grindstone, substantially as specified.

EDVARD F. EDGEGOMB. Witnesses:

DAVID DUNN, LoErNG EDeEcoMB. (70)

